Open Access Articles- Top Results for Refining
Occupational Medicine & Health AffairsRisk Assessment: Re-appraisals for Potential Hazards in the Operational Environment and Facilities of Petroleum Refining and Distribution Industry i
Journal of Powder Metallurgy & MiningBench Structural Integrity Modeling of Oil Sands for Optimum Cable Shovel Performance
Journal of Petroleum & Environmental BiotechnologyAssessment of Bioremediation of Oil and Phenol Contents in Refinery Waste Water via Bacterial Consortium
Journal of Petroleum & Environmental BiotechnologyStudies on the Radiological Impact of Oil and Gas Activities in Oil Mineral Lease 30 (Oml30) Oil Fields in Delta State, Nigeria
Journal of Petroleum & Environmental BiotechnologyOut of Sight, but Still a Blight? Petroleum Oil Dispersants: Addressing the Environmental Impact
|This article does not cite any references or sources. (December 2009)|
Refining (also perhaps called by the mathematical term affining) is the process of purification of a (1) substance or a (2) form. The term is usually used of a natural resource that is almost in a usable form, but which is more useful in its pure form. For instance, most types of natural petroleum will burn straight from the ground, but it will burn poorly and quickly clog an engine with residues and by-products. The term is broad, and may include more drastic transformations, such as the reduction of ore to metal (for which see Refining (metallurgy)).
The refining of liquids is often accomplished by distillation or fractionation. Gases can be refined in this way as well, by being cooled and/or compressed until they liquefy. Gases and liquids can also be refined by extraction with a selective solvent that dissolves away either the substance of interest, or the unwanted impurities.
Chemical reactions are often used to remove impurities of particular types.
The use of silicon and other semiconductors in electronics depends on precise control of impurities. The zone melting process developed by William Gardner Pfann was used to produce pure germanium, and subsequently float-zone silicon became available when Henry Theuerer of Bell Labs adapted Pfann's method to silicon.
Types of materials that are usually refined: